the "scan-eagle" is used to collect photographic and video images. iranian state television broadcast video of two military commanders examining the aircraft. they said it was seized "in the past few days," but they did not specify where or how. in response, the u.s. navy said none of its unmanned aerial vehicles-- u.a.v.'s-- are missing. and in washington, white house spokesman jay carney raised doubts about tehran's statements. we have no evidence that the iranian claims you cite are true. i'd refer you to the pentagon's comments this morning for details about this particular type of u.a.v., but again we have no evidence that the iranian claims are true. >> sreenivasan: a year ago, iran did manage to down a c.i.a. drone that apparently crossed the border from afghanistan. and last month, the u.s. military said another drone came under fire by iran over the persian gulf. it was undamaged. in afghanistan, a bomb blast has killed two nato troops in the country's south. the alliance says the attack happened yesterday. it did not provide the nationaliti